CN102761507A - Method for processing signals - Google Patents
Method for processing signals Download PDFInfo
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- CN102761507A CN102761507A CN2012101790431A CN201210179043A CN102761507A CN 102761507 A CN102761507 A CN 102761507A CN 2012101790431 A CN2012101790431 A CN 2012101790431A CN 201210179043 A CN201210179043 A CN 201210179043A CN 102761507 A CN102761507 A CN 102761507A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40032—Details regarding a bus interface enhancer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/14—Control of transmission; Equalising characterised by the equalising network used
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03878—Line equalisers; line build-out devices
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Abstract
A method for processing signals transmitted via a connection and received by a digital interface, where individual data frames are transmitted by the signals as a sequence of modulated symbols, and where the received signals are corrected by an equalizer,the equalizer sampling the received signals, and an adaptation of the equalizer only taking place in particular time intervals in a manner controlled by a protocol.
Description
Technical field
The present invention relates to a kind ofly be used to handle via connecting method transmission and signal that receive by digital interface, and relate to such digital interface.
Background technology
Transmission method of confirming or the transmission standard of known combination such as ISDN, Ethernet, DSL are used corrector.But these transmission method regulations are transmitted data or information continuously by the signal that sends.Yet under the situation of the so-called burst transfer that for example in motor vehicle, combines special digital interface to use, the not continuous transmission of specified data.
The special requirement that in automotive engineering, minimizes with fail safe about consumption efficiency, discharge of poisonous waste increases constantly.This causes must be at transducer or actuator and control appliance, be to transmit increasing data volume between the central controller more and more sooner.What show is, this have only through introduce new digital interface just maybe, utilize the said new digital interface can be fast and transmit high data rate reliably.Need be in this transmission that is noted that higher data rate modulates digital data to than in the past for to carry out between transducer and the control appliance on the higher transmission frequency of the employed frequency of transfer of data.
The seondary effect of carrying out transfer of data with high bit rate is, compares with this situation when the transmission in lower frequency ranges, much strong to make modulated distorted signals.The distortion of signal can cause significantly improving the bit error rate of the data that are transmitted.
This channel distortion basically can be through the corrector compensation at the receiver place.In the case, sef-adapting filter automatically is matched with channel circumstance unknown or that change.This self adaptation corrector uses in many fields of digital communication technology now.
The new corrector structure that will introduce below makes it possible under the situation of carrying out transfer of data through the new digital interface in automotive engineering, introduced and data/address bus, both significantly reduce error rate, improves many times to message transmission rate again.Because the characteristic of transfer of data in automotive field, for using in the digital transmission system in automotive field, with from document with put into practice the corrector structure known compare, must quite much change the corrector notion.
In mid-term, corrector use in the transmission system of high bit rate in automotive engineering is inevitably, thereby because such as lower data speed, than the short transmission circuit or use the replacement scheme of device pin-point accuracy and expensive to bring significant disadvantage.
Use digital interface in this external automotive engineering according to CAN standard, SENT standard and PSI5 standard in power train with in the zone, chassis.PSI5 (PSI:Peripheral Sensor Interface (peripheral sensor interface)) is the digital interface that is used for transducer; This digital interface as current interface based on two-wire circuit, and be used to expand (ausgelagert) transducer be connected on the control electronics.Especially having big meaning in these new digit transmission methods,, the result of channel distortion perhaps causes high bit error rate because limiting possible line length, data rate and bus topology for the influence of PSI5 technology speech channel distortion.
Summary of the invention
As the method for a kind of characteristic with claim 1 of background introduction with according to the digital interface of claim 6.Expansion scheme draws from dependent claims He in the specification.
Therefore introduce a kind of new corrector type in the digital interface of for example in automotive engineering, using, using.Difference with known corrector notion is described below.
The method of being introduced both can also can used under the transmission situation in voltage modulated under the transmission situation of current-modulation.
Other advantages of the present invention and expansion scheme draw from specification and accompanying drawing.
Self-evident, characteristic above-mentioned and that also will set forth below not only can be with the mode of the combination that provides respectively but also can be with the mode of other combinations or use individually, and does not depart from scope of the present invention.
Description of drawings
Fig. 1 illustrates the system of the transfer of data that is used for current-modulation.
Fig. 2 illustrates the time graph of PSI5 transfer of data: the control appliance side is sent potential pulse as synchronizing signal with fixed distance.In the given in advance thus time interval, transducer sends the packet of current-modulation.
Fig. 3 with graphical examples property the distortion of PSI5 signal when being illustrated in the inductive channel.
Fig. 4 with graphical examples property the distortion of PSI5 signal when being illustrated in the capacitive character channel.
Fig. 5 illustrates bit error rate with figure according to signal to noise ratio.
Fig. 6 illustrates the comparison according to the minimized pulse shaping of influence that should make channel distortion of prior art with four figures.
Fig. 7 is to illustrate out the sensor bus system with Star topology.
Fig. 8 illustrates the different transmission channel in the sensor bus system.
Fig. 9 is illustrated in the example of replying for different channel pulses in the bus system.
Figure 10 illustrates the PSI5 transmission highway section that has the self adaptation corrector and do not have the self adaptation corrector.
Figure 11 illustrates the principle of the PSI5 receiver with self adaptation corrector.
Figure 12 illustrates the principle of the horizontal corrector of adaptive line.
Figure 13 illustrates the compensation by self adaptation corrector channel distortion to received signal with two figures.
Figure 14 illustrates with circuit diagram has the non-linear corrector that quantizes feedback.
Figure 15 illustrates the laundering period of corrector and the coupling of PSI5 frame structure.
Figure 16 is depicted as PSI5 and receives the Data Control corrector.
Figure 17 illustrates about the control to the exchange of corrector coefficient sets of the time graph of PSI5 transmission.
Figure 18 illustrates the circuit of the coefficient sets that is used to exchange corrector.
Figure 19 illustrates the alternative basic structure of the PSI5 receiver with corrector.
Figure 20 illustrates the definition at interval of the position of sampling interval, data-mark space and Manchester's code.
Embodiment
Schematically illustrate the present invention in the accompanying drawings according to execution mode, and followingly specify with reference to accompanying drawing.
In Fig. 1, describe to be used for to carry out the structure of system of the transfer of data of current-modulation through two-wire interface.This diagram illustrates electronic control unit or ECU (electronic control unit) 10 and transducer 12, and said transducer comprises ASIC14.ECU10 and transducer 12 through be connected 20 or circuit be connected to each other.Arrow 16 is illustrated in the voltage of ECU interface.Another arrow 18 is illustrated in the voltage at sensor interface place.Describe to connect 20 all-in resistance with equivalent circuit diagram therebetween.
The PSI5 interface uses the two-wire transmission technology of current-modulation, and is as seen in fig. 1 like this example.According to the PSI5 standard, numerical data is by Manchester's code.In the case, that each (0 or 1) is modulated onto the combination of data symbol is low/high or high/low.
The duration of high or low phase place nominal ground under PSI5 transmission situation is 4 μ s, and the bit period of the data of Manchester's code continues 8ms thus.This is corresponding to the data rate of 125kbit/s.Alternately, the PSI5 standard also allows the bit period of 53 μ s, and this is corresponding to the data rate of 189kbit/s.
The PSI5 data are organized in Frame, and its length can be 11 to 33.Between Frame, exist and pause (Pausen), wherein do not carry out transfer of data.Except that asynchronous transfer mode, PSI5 also has synchronous transfer module.In the case, the pulse of control appliance transmission voltage modulation, for example lock-out pulse or " Sync pulse ", it also can be called trigger impulse, and transducer is from wherein deriving time coordination or the timing that is used to send its Frame.PSI5 can also realize bus transfer in synchronous mode, because each user of bus can derive the time point that is used to send its data from lock-out pulse.Because the clock that transducer possibly not have pin-point accuracy is as clock pulse generator, the time base of transducer possibly change with respect to the time base of control appliance.This result who has is that the time point that transducer sends its PSI5 Frame also possibly change with respect to the time base of control appliance.Transmitter, for example transducer or actuator self sends data in asynchronous mode.Receiver, normally control appliance must receive data and correspondingly correction.Therefore receiver is adapted to the data self that received.
Fig. 2 illustrates the PSI5 transfer of data that triggers through signal 30, and said signal is exported by control appliance under the situation of synchronous transmission, and said signal transmitting synchronous pulse 32.With to lock-out pulse regular time than definition time window 34, wherein have the PSI5 Frame 36 of the reality of sending by transducer.For each transducer can be programmed nominal time started 38 of PSI5 Frame 36.
The amplitude of the signal that is transmitted and the linear distortion of phase place cause pulse shape to change and the pulse that is unfolded interferes with each other.
Fig. 3 and Fig. 4 illustrate the Manchester's code that is sent out the PSI5 signal example and in the pulse of the corresponding distortion at receiver place.In Fig. 3, drawing with μ s at abscissa 100 places is time of unit and to draw with A at ordinate 102 places be the electric current of unit.Curve at the curve of the signal 104 that will transmit shown in this figure and the signal 106 through transmission (inductive channel) distortion.
In Fig. 4, drawing with μ s at abscissa 120 places is time of unit and to draw with A at ordinate 122 places be the electric current of unit.Curve at the curve of the signal 124 that will transmit shown in this figure and the signal 126 through transmission (capacitive character channel) distortion.
Route Length and corresponding wiring line are depended in the distortion of PSI5 signal very consumingly.Example among Fig. 3 and 4 illustrates the distortion of the PSI5 signal that is transmitted, and it fully maybe in the scope of the circuit and the tolerance of in the PSI5 standard, stipulating of wiring parameter under situation of point-to-point connection.
Fig. 3 and 4 shows that the distortion of transmission signals causes the remarkable variation of transmission quality.
Fig. 5 according to the example of the transmission channel of Fig. 3 illustrate bit error rate can be how because channel distortion and significantly raising.At this, drawing with dB at abscissa 150 places is the signal to noise ratio of unit and bit error probability when being depicted in the PSI5 transmission at ordinate 152 places.First curve 154 illustrates the error (ideal communication channel) that detects through the PSI5 error identification; Second curve 156 illustrates the error (inductive channel) that is detected; The 3rd curve 158 illustrates the error (ideal communication channel) and the 4th curve 160 that do not detect the error (inductive channel) that does not detect is shown.Double-head arrow 162 expression bit error rates are because the growth of channel distortion.
In practical application, when modulated digital signal, replace the rectangular pulse limited pulse of utilized bandwidth or rather, for example have the pulse at the edge of S shape rounding with big bandwidth.This at first is used to reduce through the radiation of said signal in high-frequency range.This moulding or be shaped has the advantage that can reduce the distortion that under many possible circuit types situation, causes through channel in addition.
Fig. 6 illustrates the comparison of the rectangular pulse and the transmission of the pulse at the edge (shaping) with rounding about channel distortion with four figures for this reason.At this, draw at abscissa 180 places respectively with μ s and be the time of unit and draw signal level at ordinate 182 places.Shown in the example among Fig. 6, though the influence of channel can be reduced through the band restriction of signal, the signal that is received continues distortion.
Be different line topological below communication is used between control appliance (ECU:electronic control unit (electronic control unit)) and peripheral cell (like transducer or actuator) in automotive engineering:
Point-to-point connection
Bus connects.
Under the situation of point-to-point connection, special-purpose circuit is provided for each peripheral cell (transducer, actuator) for communicating by letter with control appliance.And a plurality of peripheral cells (transducer, actuator) are shared a circuit connection to control appliance under the situation that bus connects.The big advantage of data highway system is to save the circuit in the vehicle.This external control appliance place needs less digital interface.
Fig. 7 illustrates the example of the sensor bus system with Star topology.This diagram illustrates control appliance 200, first sensor 204, second transducer 206 and the n transducer 208 with ECU202.
Transmit through simple bus topology for the point-to-point transmission plan alternatively for the PSI5 system.Yet the shortcoming of said bus topology is, than under the situation of point-to-point connection, causing much strong distorted signals.Though users's (peripheral cell) different in bus system share a physical transfer circuit, yet the transmission channel between each user and receiver is different basically.
Fig. 8 illustrates the transmission channel in the sensor bus system.At control appliance this illustrate 220, first sensor 222, second transducer 224 and the n transducer 226.Correspondingly can see first transmission channel 230, second transmission channel 232 and the n transmission channel 234.
This diagram illustrates, and between each transducer 222,224,226 and control appliance 220, has different channels, and they also can have different channel pulses respectively replys, as shown in fig. 9 like example.
Fig. 9 is illustrated in the example that channel pulses different in the bus system is replied.At this, draw at abscissa 250 places with μ s and be the time of unit and draw signal level at ordinate 252 places.This diagram illustrates for the channel pulse of the different channels with different line topologicals and Channel Transmission function and replys, and this causes different distortions.
The linear distortion of transmission channel can make and set up initial transmission signal once more at the receiver place once more by the cancellation of self adaptation corrector.The signal that filtering for this reason received is so that compensate for channel distortions.The sef-adapting filter of corrector can automatically be matched with channel circumstance unknown or that change at this.
The self adaptation corrector uses in system that a lot of circuits connect and wireless system in the communication technology.Yet the self adaptation corrector is not used so far under the situation of the digital data transfer in automotive engineering.To this one possible reason is that using with analog to digital converter of self adaptation corrector is prerequisite; Said analog to digital converter has a plurality of resolution, and current most of modulated (numeral) reception signal is changed back its digital value by 1 simple and suitable bit comparator in automotive engineering.Another possible reason is, under frequency range of using so far and transmission line situation distortion so not big as yet, promptly enough with the simple comparator demodulation of applying.
Yet the situation in PSI5 transmission of being noted that is issued to or surpasses the limit about data rate and line topological, wherein under the situation of no corrector, can transmit with little error rate.The distortion of the PSI5 signal that the influence through transmission line and wiring causes as above-mentioned, possibly cause transmission quality variation consumingly.The distortion of the signal that passes through to be received, the signal to noise ratio variation, this causes transmission error rate to raise.The pulse that is unfolded in addition interferes with each other, and this is called intersymbol interference, and causes transmission error equally.But these distortions can be through the simple corrector circuit cancellation at receiver place.
The use of the self adaptation corrector in the PSI5 system brings significant advantage with the systematic comparison of only using simple sampling comparator to be used to weigh number conversion.The advantage of the use of corrector for the PSI5 system particularly in:
Without a doubt can be in (＞10m) the upward transmission of long circuit.Though channel distortion increases with line length, yet corrector can compensate said distortion.
Unrestrictedly can carry out the PSI5 transmission with the data rate that is higher than 125kbit/s.Therefore can realize with 189kbit/s or even the PSI5 transmission of 250kbit/s.Correction through receiving signal does not produce intersymbol interference yet under the situation of high data rate.
Can realize bus topology, because the channel distortion that the corrector compensation produces in the case.
The tolerance of employed member does not suffer so strict requirement, because corrector is matched with unknown channel condition.This also is applicable to the requirement for transmission line.
Through the pulse shaping of sending signal, can lower the radiation that causes through the PSI5 transmission about as far as possible little radiation optimization.Corrector can convert this into rectangular pulse through the pulse that polishes once more.
Explanation typically has at present the PSI5 transmission highway section of sampling comparator and has principle difference between the PSI5 transmission highway section of the self adaptation corrector at receiver place in Figure 10.
Figure 10 illustrates typical PSI5 transmission highway section and transmits the comparison in highway section with the PSI5 with self adaptation corrector.At this, the zone of transducer 270 is shown in the left side and the zone of control appliance 272 is shown on the right side, it connects 274 through two-wire respectively and is connected to each other.This figure is the signal 276 in Manchester's code shown in the zone of transducer 270 on top, and it is shaped modulated 278 by the slope.After transmission, sampled 280 in the sampling comparator of this signal in control appliance 272.The symbol that is detected is represented in frame 282.Make said symbol stand majority vote, make to exist in the symbol of representing in the frame 284.
The signal 290 and its modulation 292 of Manchester's code are shown in this diagram bottom once more.The signal that in control appliance 272, is received and then revise 296 with the self adaptation corrector with n position analog to digital converter sampling 294.The symbol that expression is detected in frame 298 then.
In typical PSI5 receiver, make 1 judgement (level 0 or 1) by the sampling comparator.Symbol based on said judgement decoding Manchester's code.
In having the PSI5 receiver of corrector, utilize multistage n position analog to digital converter to be digital data word to the receiver conversion of signals.The self adaptation corrector is the filter of back with decision device (0,1).Self adaptation corrector compensate for channel distortions, make filter output signal (approx) have level 0 or 1.
The principle of the PSI5 receiver with adaptive line corrector roughly is shown with graphics mode in Figure 11.At this, the curve of the signal of in first figure 300, describing to receive 301 is described the curve that ADC exports curve, the reception signal 303 of being sampled of signal and in the 3rd figure 304, describes the output signal of sef-adapting filter in second graph 302.Each is shown below handles level, that is sampling apparatus 306, n position quantizer 308, sef-adapting filter 310, decision device or judgment device 312 and manchester decoder device 314.
, the corrector of reality obtains the coefficient c of the optimum of sef-adapting filter in realizing by alternative manner
iFor example lowest mean square (LMS) algorithm is the adaptive approach that the corrector coefficient is optimized in known being used for (based on mean-square error criteria).
The iteration optimization of corrector coefficient realizes by the error signal that is minimized.Error signal e
nBe the corrector output signal a that hopes
nCorrector output signal y with reality
nBetween difference.Utilize this error signal and corrector input data vector x
n, as described in the equation below, adaptive iteratively corrector coefficient:
c
n+1＝c
n+Δ·e
n·x
n
C: the vector of filter coefficient weight
X: input vector (reception data)
y
n: the output signal of sef-adapting filter
e
n: evaluated error
e
nXn: the estimation of gradient vector
Δ: step parameter (step pitch).
The horizontal corrector of linear adaption implement the corrector equation of narration here at the block diagram shown in Figure 12.Under the performance of simplifying, replace error signal e
n, e
nSign can be as the input signal of coefficient update mechanism.
In Figure 13, the compensation by self adaptation corrector channel distortion to received signal exemplarily is shown according to the PSI5 signal.This diagram illustrates two figures, wherein exports in the signal input at corrector place shown in first figure 450 with at the signal at corrector place shown in the second graph 452.In two figures 450 and 452, draw at abscissa 454 places respectively with μ s and be the time of unit and draw signal level at ordinate 456 places.
When having the correction of single sampling (sampled value of each data symbol), need make receiver accurately be synchronized to the clock pulse speed that receives signal.The corrector performance is at clock pulse synchronization aspects accurately very sensitive (error of timing phase causes the aliasing error of corrector signal).Be different from this, have the timing phase arbitrarily that the correctors of two samplings or many samplings can compensating sampling.Therefore the corrector (Fractionally-spaced equalizer (faint spaced equalizers)) that has two samplings or many samplings is equivalent to the matched filter of back with the corrector with single sampling.
According to receiver architecture the corrector principle is shown so far with linear corrector (onrecurrent corrector).Under some transmission channel situation, the channel on the unit circle can cause the odd number of corrector to be separated zero point.Under the situation of linear corrector, can amplify noise by this way.
Use in this case and have the non-linear corrector (Decision Feedback Equalizer (DFF)) that quantizes feedback.Have the corrector that quantizes feedback and have two sef-adapting filters, be i.e. feedforward filter (or Feed forward Filter) and feedback filter (or Feedback Filter).The input signal of feedforward filter is the data that receive, and has the symbol of being surveyed in input place of feedback filter.
Figure 14 illustrates has the nonlinear distortion device (Verzerrer) that quantizes feedback, and it is totally represented with Reference numeral 460.This nonlinear distortion device comprises feedforward filter 462 and feedback filter 464.
The boundary condition that is used to revise the PSI5 signal is different from the boundary condition of the signal that is used to revise transmission system that known circuit connects such as DSL, ISDN or Ethernet at some basic point places.
The special boundary condition that is used for the corrector of PSI5 system:
Burst transfer (the short frame that has data is the stage of no signal therebetween)
Drift in the last transmitter frequency of t＜1ms
Send variance ± 5% of frequency
The difference on the frequency of frame in succession until 10%
The bus structures system causes the channel pulse of conversion in Frame in succession to be replied.
PSI5 transmission is for the basic difference of the transmission system that known circuit connects, and signal is not as continuous data flow transmission under the PSI5 situation, but each Frame is as the sequence transmission of modulated symbol, and example is as it be shown in fig. 2.Between frame and at the duration of (the control appliance side) lock-out pulse, there is the pause of PSI5 transmission, wherein do not transmit modulated signal.About revising, the PSI5 transmission can be regarded as burst transfer.
For this reason, different with known corrector notion, to expending very much synchronously of the clock of transmitter, because only during short burst duration, can carry out obtaining to the clock pulse phase place of transmitter.Therefore be difficult to use receiver and corrector to be synchronized to the corrector notion of clock pulse phase place.
As stated, the performance that has two samplings or the correctors of sampling for the selection of sample phase insensitive (because only must be synchronized to the clock pulse speed that receives signal here) more.About the enforcement in the PSI5 system, this means the corrector of replacement with single sampling work, use corrector type (Fractionally-spaced equalizer (faint spaced equalizers)) with many samplings.That is to say that corrector uses two or more sampled values as input signal for each Manchester half symbol.
For revising the PSI5 signal in the bus system, also add other difficulty:
Each user's channel has different channel pulses respectively replys, as at Fig. 7, shown in 8 and 9.This causes the signal distortion in a different manner of the PSI5 frame in succession in the bus system.Corrector can not adapt to definite channel, because reply conversion at bus signal in service with different respectively channel pulses.
Each user's clock can have different frequencies.Therefore the character rate of each user's transmission signal also differs from one another.In succession mark space duration of frame is strong different each other thus.
The corrector system point aspect below that is used for the PSI5 receiver is with different from the known corrector system of document and reality:
The corrector that is used for the PSI5 receiver can either also can be the configuration of the operation in the asynchronous mode for the operation of synchronous mode.The operation of point-to-point transmission and bus is possible in synchronous mode.
As stated, control appliance sends pulse in synchronous mode, utilizes said pulse to trigger the transmission of PSI5 frame at the transducer place.Transducer confirms the transmission rate of PSI5 signal with the asynchronous clock of ECU in asynchronous mode.
The key character that is used for the corrector of PSI5 system is that said corrector support receives two samplings or many samplings (Fractionally-spaced equalizer (faint spaced equalizers)) of signal.That is to say corrector many times (Fractionally-spaced equalizer (faint spaced equalizers)) work, as stated with character rate.
In synchronous mode, the data transfer phase of interface enough triggering signals of ability or synchronizing signal monitoring transmission device thus can be with the running status of corrector and the data transfer phase coupling of transmitter.In asynchronous mode, the order of the running status of corrector (Abfolge) is derived from the data transfer phase that receives signal.
The adaptation of corrector is only carried out with the time interbody spacer of confirming (Zeitinterintervallen).Laundering period can and stop by another unit (for example state machine (or state machine)) starting.Corrector is in adaptive pattern, or the adaptation mechanism of corrector coefficient stops (Equalizer frozen (equalizer freezes)).Laundering period is coupled to PSI5 transmission and PSI5 agreement.
When bus use in service PSI5, must expand known corrector notion as follows, the different transmission channel that is each transducer has the corrector coefficient sets of oneself available respectively.Because difference is replied in the channel pulse of PSI5 frame in succession, so must exchange the corrector coefficient respectively.Corrector is used alternatingly coefficient sets.Each distributes to therefore enough its suitable coefficient corrections of ability of channel of respective sensor.Need state machine, following task and the function of said state machine control:
Exchange corrector coefficient
With coefficient exchange and the coupling of PSI5 agreement.
This state machine is that corrector is carried out a plurality of tasks:
The on the one hand conversion in state machine control stage, in the said stage corrector or be in adaptive pattern or in the said stage corrector adapt to and stop (Equalizer frozen (equalizer freezes)).Under the corrector situation that is used for the operation of PSI5 bus, this state machine is also controlled the exchange of corrector coefficient, and said corrector coefficient is distributed to the corresponding transmission channels of each transducer at bus place.State machine can (alternatively) only allows the adaptation (for example only at system initialization time) of corrector in the stage of confirming of the operation of system in addition.
When can expect for knowing in fact when PSI5 frame and this PSI5 frame arrive, and state machine needs different input informations in the time interval of predesignating.
Receiver can expect that the time window of PSI5 Frame is definite through the timer of PSI5 agreement and PSI5 transceiver.About the information of the sequence of PSI5 Frame window, the state machine of PSI5 corrector obtains from PSI5 monitoring (Kontroll) and regulon, the also responsible PSI5 agreement implementation of said PSI5 monitoring and regulon.
The temporal information of the also triggering PSI5Sync pulse (lock-out pulse) of the timer of transceiver can supply state machine to use equally.State machine can confirm to expect the time location of the window of PSI5 frame within it thus.
Figure 15 illustrates the laundering period of corrector and the coupling of PSI5 frame structure.On diagram top 470 state of corrector is shown at this, and in the bottom 471 reception is shown the PSI5 Frame.At time point 472, the coefficient sets that is used for transducer n is from the memory load to the sef-adapting filter.Corrector is taked first state 473 " coefficient freezes ".At another time point 474, detect the beginning of frame.Then corrector takes second state 475 " adaptive pattern " up to another time point 476, at this another time point, detects the end of frame.Then corrector is taked the third state 477 " coefficient freezes ".At time point 478, in the memory of sef-adapting filter, write the coefficient sets that is used for transducer n.
Represent PSI5 Frame window and represent the PSI5 Frame with double-head arrow 480 in the diagram middle and lower part with double-head arrow 481.Double-head arrow 483 express time intervals and double-head arrow 485 express time tolerances.Another double-head arrow 487 expression beginning sequences.The laundering period of corrector is depended on agreement and lock-out pulse or trigger impulse.
The time window that corrector can adapt to is positioned at the time window (referring to Figure 15) that can expect the PSI5 frame.For confirming the corrector laundering period, when the PSI5 frame that state machine need receive begins the information when the PSI5 frame with said reception finishes.State machine obtains to begin the information with the PSI5 frame end about the PSI5 frame from PSI5 demodulator and decoder.The PSI5 demodulator comprises the mechanism that is used for explore frame initial sum frame end.
Can make the adaptation window that corrector coefficient within it can adapt to and the PSI5 frame synchronization of arrival by this way.
In service in bus, the PSI5 of state machine monitoring and regulon provide about the number of sensors at bus place with about the information of the generic sequence of the transmitting time window of corresponding transducer.Exchange needs these information for the corrector coefficient.
Figure 16 illustrates and is used for the control that PSI5 receives the corrector of data.The state of corrector can be coupled with the time flow of PSI5 transfer of data thus.This diagram illustrates state machine 500, self adaptation corrector 502, has receiver, demodulator and unit 504, timer or the timer 506 of PSI5 decoder, the reflector 508 with pulse generator and PSI5 controller 510.
When not needing the coefficient exchange at the corrector place under the situation of point-to-point connection (synchronously or asynchronous), receiver must alternately use the coefficient sets of giving each transducer or channel allocation respectively in mode bus.
Figure 17 illustrates the time interval of PSI5 transmission with time graph.At this control of the exchange of corrector coefficient sets is described.The signal 541 that this diagram illustrates time shaft 540 and exported by control appliance, this signal is loaded with lock-out pulse 542.The time slot or time slot (the Time slots) 550 of bus user correspondingly are shown, wherein corrector coefficient sets 554 through read procedure 560 with write process 562 and read-write memory 570 exchanges.
The time slot 550 that each transducer at bus place can transmit is therein represented through the synchronizing signal of control appliance.The order of the transmission window of each bus user and possible duration are confirmed through given in advance host-host protocol.Know thus, in which of corrector, need distribute to the coefficient sets of corresponding transducer in the time interval.
These coefficient sets were read in from the sef-adapting filter of Writing/Reading memory to corrector at the beginning that is the time window of corresponding transducer setting, and were written back to once more in this memory in the end of this time window.
How Figure 18 illustrates alternately from memory read and the suitable coefficient of write-back again.At this, the coefficient sets of depositing at read-write memory 602 that switch 600 is used for exchanging corrector is shown.Therefore coefficient sets is read (arrow 604) and is write (arrow 606).
For there is different possibilities in the initialization receiver: confirm beginning coefficient sets in order to the adaptation of beginning corrector.A kind of simple solution is that the corrector coefficient adapts to again when each run.The corrector coefficient sets is not stored.Another kind of possibility is that corrector begins with the fixing compromise coefficient sets that typical channel is suitable for.Laundering period can be shortened by this way.
If adaptive coefficient sets when the end of transmission, be stored and available once more during in initialization when next moves then, then the fastest adaptation of corrector is possible.The variation of channel is very little usually and very slow.
Being used for foundation structure different under the situation of the corrector that the PSI5 receiver uses is possible.These foundation structures are basically aspect corrector coefficient update and sampling rate or the data rate coupling that receives and be different aspect the corrector coefficient update Select Error signal.
The coefficient update of corrector can be to carry out in the speed of the sampling at ADC place or more slowly, for example carry out with the speed of the data symbol that receives.
Figure 19 illustrates the various structure of the receiver with self adaptation corrector.At the A650 of structure this illustrate, structure B 652, structure C 654 and structure D 656.Under all structure situation, receive 660 signals, said signal is sampled in ADC 662.The main distinction of these structures is to be divided into different clock pulse territory and territory to RX path; Signal processing is carried out (n* character rate with the speed of over-sampling in said clock pulse territory; Wherein signal be processed with character rate and in said territory signal be processed with bit rate.Among this external structure A 650 filter coefficient adjuster 664, sef-adapting filter 666, judgment device (High/Low (high/low)) 668 and manchester decoder device 670, the data bit 672 of said manchester decoder device output decoder.
At filter coefficient adjuster 690 shown in the structure B 652, sef-adapting filter 692, judgment device (High/Low (high/low)) 694, sampling and sign synchronization 696 and manchester decoder device 698 fall.The signal Synchronization that in frame 696, makes two-forty sampling is to the symbol clock pulse, and signal fallen samples character rate.Error signal 700 is exported with character rate.The sampled value (low/high (low/height)) 702 that judgment device 694 outputs are detected.The detection of manchester decoder device 698 execution Manchester symbols.The territory of signal processing and signal processing is wherein carried out in arrow 714 expressions with bit rate zone are wherein carried out with character rate in the territory that arrow 710 expressions are wherein handled with n* character rate oversampled signals, double-head arrow 712 expressions.
In the sef-adapting filter 722 (feedforward/feedback) of filter coefficient adjuster 720 shown in the structure C 654, corrector, judgment device (High/Low (high/low)) 724, sampling and sign synchronization device 726 and manchester decoder device 728 fall.Sampling and sign synchronization device 726 output error signals 729 and the data symbol (high/low (just)) 730 that is detected fall.The territory of signal processing is wherein carried out in arrow 732 expressions with over-sampling n* character rate, double-head arrow 734 expressions are carried out the territory of signal processing and signal processing is carried out in arrow 736 expressions with bit rate territory with character rate.The manchester decoder device is carried out the detection of Manchester symbol.
In structure D 656, comprise filter coefficient adjuster 800, sef-adapting filter 802, judgment device (High/Low (high/low)) 804 and manchester decoder device 806.Judgment device 804 and manchester decoder device 806 formation unit 810, the symbol 812 that this unit output is detected.Manchester decoder device 806 output error signals 814 in addition.Arrow 820 representes to carry out with over-sampling the territory of signal processing, and the territory of signal processing is carried out in arrow 822 expressions with bit rate.In frame 810, carry out Manchester symbol detection, according to the data symbol that receives synchronously and sampling falls.
In structure A 650, the data of reception are sentenced data character rate n ratio doubly by over-sampling at ADC.Figure 20 explains the ratio of the data bit of sampled value, data symbol and Manchester's code.In diagram, data value 900 is shown on top.The 902 expression sampling intervals of double-head arrow.Data symbol 904 is shown under it.The interval of double-head arrow 906 expression data symbols.This diagram illustrates the data bit 908 of Manchester's code at last.This diagram illustrates three levels: with the signal of which rate processing reception.
Correction is carried out according to the data symbol of n times (n-fach) sampling.Produce error signal with the sampling value work of n times of character rate and for corrector coefficient update equally in the latter linked judgment device 668 of sef-adapting filter (Level High/Low (level height)) with this speed.
Height/low (High/Low) signal that manchester decoder device 670 obtains the n sampling is as input signal.In manchester decoder device 670, proceed to now reception data symbol synchronously with to the sampling of falling of bit rate.
If the abundant is-greater-than symbol speed of the sampling rate at ADC 662 places then need not make the sample frequency and the symbol frequency at ADC 662 places synchronous.And the sample frequency that when the sampling rate at ADC 662 places low (for example 2x character rate), need make ADC 662 places arrives the synchronous of symbol frequency.
In structure D 656, judgment device 804 and 806 associatings of manchester decoder device.The decision device of this combination and manchester decoder device also produce error signal 814 for the coefficient update of corrector.
If corrector adapts under the reception RST of the interference with very little addition, then constitute coefficient sets thus, said coefficient sets is optimum for the situation of very little interference.But under the situation of such corrector coefficient sets, possibly take place: the interference of amplifying emergent addition through corrector.For avoiding amplifying the interference of addition, add the noise of artificial addition can for the corrector adaptation signal through corrector.In this case, corrector adapts to like this, makes the minimize interference of channel distortion and addition.
The PSI5 Frame of the enough typical Manchester's codes of adaptation ability of the corrector in the PSI5 receiver carries out without a doubt.The data of Manchester's code have characteristic: said data have high and low phase place for identical component, and this adaptation for corrector has advantage.
The special training signal that alternately, can utilize transmitter when the transmission beginning, to send is realized the fast adaptation of corrector.Such training signal for example can be made up of height that replaces fast and low level longer sequence.
Claims (10)
1. be used for handling via connecting method (20) transmission and signal (301) that receive by digital interface; Wherein utilize signal (301) to transmit the sequence of each Frame (36) as modulated symbol; And wherein utilize the signal (301) of corrector (502) corrected received; The signal of the reception of wherein being sampled (303) is used as input signal for corrector (502), and the adaptation of corrector (502) is only carried out with the time interval of confirming by agreement control ground.
2. method according to claim 1, wherein, the laundering period is by state machine (500) beginning and end.
3. method according to claim 1 and 2, wherein, the multiple sampling of the signal (301) that corrector (502) receives.
4. according to the described method of one of claim 1 to 3, wherein, signal (301) transmits via point-to-point connection.
5. according to the described method of one of claim 1 to 3, wherein, signal (301) transmits via bus system, and carries out the conversion of the coefficient sets (514) of at least one sef-adapting filter (310,666,722).
6. digital interface; Be used in particular for carrying out according to the described method of one of claim 1 to 5; Said digital interface has corrector (502), and wherein the adaptation of the sampling of corrector (502) signal (301) that is configured to receive and corrector (502) is only carried out with the time interval of confirming by agreement control ground.
7. digital interface according to claim 6, it is configured to the interface of signal current-modulation or voltage modulated.
8. according to claim 6 or 7 described digital interfaces, it can utilize and trigger the perhaps data transfer phase of synchronizing signal (32,542) monitoring transmission device, thus can be with the running status of corrector (502) and the data transfer phase coupling of transmitter.
9. according to claim 6 or 7 described digital interfaces, wherein, the order of the running status of corrector (502) is derived from the data transfer phase that receives signal.
10. according to the described digital interface of one of claim 6 to 9, wherein, for the adaptation of corrector (502) is provided with state machine (500).
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| DE201110007846 DE102011007846A1 (en) | 2011-04-21 | 2011-04-21 | Method for processing signals |
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| US (1) | US8942281B2 (en) |
| KR (1) | KR101942104B1 (en) |
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| CN105765915A (en) * | 2013-10-09 | 2016-07-13 | 罗伯特·博世有限公司 | Subscriber station for a bus system, and method for wideband CAN communication |
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| DE102014219004A1 (en) * | 2014-09-22 | 2016-03-24 | Continental Teves Ag & Co. Ohg | Signal processing device for processing a measurement signal in a motor vehicle |
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| DE102016215640A1 (en) * | 2016-08-19 | 2018-02-22 | Robert Bosch Gmbh | Method, sensor and control device for transmitting a data packet from a sensor to a control device |
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| DE102011007846A1 (en) | 2012-10-25 |
| US8942281B2 (en) | 2015-01-27 |
| US20120269253A1 (en) | 2012-10-25 |
| KR20120120069A (en) | 2012-11-01 |
| KR101942104B1 (en) | 2019-01-24 |
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